Grinding glass.



No. 760,765. PATBNTBD. MAY 24, 1904,

' o.c.sTUTz.

GRINDING GLASS.'

.APPLICATION FILED Nov. 2o, 1903` No MODEL. l 4 SHEETS-SHEET 1.

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WITNESSES: INVENTQR TH: Nonms warms cn., vuoto-Inno., wAsmNoYoN. c.

`1 ATBNTED MAY 24,1904 I c. o. sTUTz.l GRINDING GLASS. APPLICATION FILED NOV; 20, 1903.

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NO MODEL.

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110.760,76.. f PATBNTED MAY 24, 1904. v .0. c. sTUTz.

GRINDING GLASS.

`AIILIGA'JJION FILED NOV. 20, 1903. N0 MODEL.. 4 SHEETS-SHEET 3` TH: NoRms Pzrgns co. PMOYQMYHQ. WASHINGTON. n. c.

PATBNTED MAY 24, 19.04. c. c. sTUTz. yGRINDING GLASS. APPLIUATION FILED NOV. 20, 1903.

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` 35 the bed of the machine.

UNITED .STATES Patented May 24, 1904."`

PATENT OFFICE.

CHARLES C. STUTZ, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THE PITTSBURGH PLATE GLASS COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OE PENNSYLVANIA.

GRINDING GLASS,

SPECIFICATION forming partlof Letters Patent No.`760,765, dated Mayv 24, 194.

Applioa'oion filed Novombor 20,1903. sooioi No. 181,921. (Nomodoi.) n

ATo all whom t may concern,.-

Beit known'tha't I, CHARLES CSTUTZ, acitizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Grinding Glass, of which improvement the following is a specication.

The invention described herein relates to 1 o certain improvements in mechanism for rounding the edges of plates-such, for example, as

sheetsor plates of glass-and has for its object a construction and combination of parts or elements whereby the plate or grinder is moved onerelative to the other in directions at an angle to each othervor inthe arc of a circleconcentric with the axis of the tool. The, invention is hereinafter more fully described and claimed. l

2o In the accompanying drawings, forming a part of this specication, Figure .1 is a top plan View of my improved machine. Fig. 2 is a front elevation of the same. Fig. 3 is an end elevation of the machine on an enlarged scale.

Fig. lois a detail View of the supporting-bed and clamp. Fig. 5 is a detail view of the lstopping and starting rc-lutch mechanism, and Eig. 6 isk a diagrammatic View illustrating the operation of the machine.

v3o lIn the practice of my invention the toole. g., grinder l-is mounted in suitable bearings on the standards or pedestals 2, vwhich are connected at their lower ends by suitable channel-bars 3, properly braced and forming The tool or grinder is rotatedby meansof a belt passing around Vthe pulley 4, and a reciprocating movement is imparted to the grinder by means of an eccentricA 5 on a shaft 6, the strap of such eccentric being connected to a collar 7, arranged between shoulders 8 on the grinder-shaft. The shaft 6 is driven by the belt passing around Y the pulley 9 through a Worm-and-gear connection. A'second gear connection. extends from the shaft of the pulley 9 to operate the gear-wheel 12 on the counter-shaft 13. Crankarms 14' are secured on the ends of the couninto the slides 17.

ter-shaft and are connected by links 15 to one end of rocking levers 16, which have their axis in line with the axis of `the tool and to 5o this end may be loosely mounted on the shaft' of the grinder. As clearly shown in Fig.V 3, levers 16 are'provided at one end with guides for the movable blocks 17. It is preferredto form these guides by slotting the levers/in 55 the manner shown. Provision is made for the adjustment of the blocks along the guides by means of the screws 17 a passing through the end walls of the slots and engaging the slidingy blocks. pivotally connected to the sliding blocks 17, preferably f by means of pins 2O passing through the ends of the clamping-arms'and One member of each pair of arms 19 has a pivotalconnection to the o 5 supporting-bed 21, and the other-member ofl i each pair has a similar connection tothe clamping -bar 22; l The connection of these parts 'with the arms is formed by pintles 23, projecting from the ends of the bed and-clamp- 7o ing-bar and into suitablev openings in the clamping-arms. Provision is'made for shifting the outer ends of the arms so as to move the bed and clamping-'bar toward and from :each other by` screws 24, passing through blocks 25', pivotally mounted on the ends of the clamping-arms, as clearly shown in Figs. 2 and The clamping-bed consists ofend rails 26, connected by angle-bars 27, which are braced yintermediate ofthe rails by suitable 8ocross-bars, as shown inFig. 1. It is preferred to form the upper face of the supportingbed bywooden slats, which will form an elastic or yielding Vcushion for the plates laid thereon. The clamping-bar 22 is formed by 85 an angle-bar'which has short wooden bars or slats secured to the under face. The rails -of the supportingbed rest upon rollers 28, mounted on brackets extending from the bed of the machine, so thatthe supporting-bed can 90 4be moved back and forth,` as hereinafter de'- scribed. Y

In operating the machine av` plate of glass or other material is placed upon the :support- Clamping-arms `18 and 19 are-6o.

ing-bed with the edge to be ground projecting beyond the inner line of this bed. The screws 24 are then operated to first shift the clamping-bar 22 down upon the glass or plate, and as soon as a iirm bearing of the clamping-bar on the plate is eected the continued rotation of the screw will move both the bed and the clamping-bar toward each other, so that the clamping action will be uniformly toward the surface of the plate. If the supportingbed when the plate is clamped thereon, as in the position shown in Fig. 3--z'. c., with its upper surface in or approximately in a horizontal plane passing through the axis of the grinding-roller-and the machine is constructed so that the crank-arms 111 are rotated in the direction of the arrow in Fig. 3, the table and plate will be moved downwardly by the levers 16 and also inwardly under the grinding-roller, as shown in full lines in Fig. 6, whereby the upper corner of the-plate is'rounded. As the crank-arms continue to rotate past the position shown by the full lines in Fig. 6 the supporting-table, with the plate, will be moved upwardly and outwardly until it again reaches the position shown in Fig. 3, thereby giving a smoothing cut to the previously-rounded portion. `As the arms 14 continue to rotate the table will be raised and moved forwardly over the grinding-stone to the position shown by the dotted lines in'Fig. 6 and Aback again along the 'same path until it reaches the position shown in Fig. 3, whereby the lower corner of the plate is cut away and curvature given to the plate. It will be observed that although the edge of the glass has traversed a convex surface coincidentv with the are of a circle concentric with the axis of the grinder the movement has been' such that this convex surface-z'. e., the periphery of the grinding-stone-'will produce a convex surface on the edge of the plate operated upon, and, further, it will be observed that the edge of the. glass is caused to move twice over the same grinding-surface, a rough grinding being effected during the first movement and a smoothing action being efeeted on its next movement. As it is only necessary to have one revolution of the crank-arms to effect this double grinding, provision is made for stopping the machine after cach revolution of the crank-arms. To this end the gear-wheel 12 is loosely mounted upon the counter-shaft 13 and is provided with one member of a clutch, the other member 29 being keyed to the shaft 13, so as to permit of its movement along the shaft, but to cause the'shaft torotate therewith. This clutch is moved back and forth by means of a -lever 30, connected by a rod 31 to a treadle 32. A spring 33 is so arranged as to normally tend to throw the movable member of the clutch out of engagement with the member on the gearing-wheel 12. 'After the glass has been clamped upon the bed in the manner described the operator pushes down the treadle, thereby throwing the member Q9 of the clutch into engagement with the other member and compressing the spring. On the lirst movement of the member 29 of the clutch and the shaft 13 a collar 34: on the member 2.9 is shifted so as to bring a slot or notch 35 therein out of alinement with an arm 36 on the bed of the machine, so that thereafter this arm will hold the members of the clutch in engagement and allow the operator to remove his foot from the treadle. Asy the clutch and shaft complete theii` revolution the notch in the collar 34 will come into alinement .with the arm 36, whereupon the clutch member 29 will be shifted by the spring out of engagement with the member on the gear-wheel. This collar is adjustably mounted on the clutch member 29, so as to permit of the stopping and starting of the machine in any desired position of the bed 26. It will be understood that if it is necessary or desired to cause the plate to traverse the tool three or more times the operator will hold the treadle down and prevent disengagement of the members of the clutch.

By adjusting the slides 17 on the levers 16 the curvature to be given to the edge of the glass can be varied, the curvature being increased by shifting the slides outwardly.

I claim herein as my invention- 1. In a machine for rounding the edges of plates, the combination of a plate-holder, a tool and means for moving one of the said parts or members around a portion of the other in the arc of a circle concentric with the axis of the tool, substantially as set forth.

2. In a machine for rounding the edges o1. plates, the combination of a plate-holder, a tool, means for moving one of said parts ol' members around the other in the are of a circle concentric with the axis of the tool, and means for automatically stopping such movement, substantially as set forth.

3. In a machine for rounding the edges of plates, the combination of a plate-holder, a rotating tool and means for moving the plateholder in the arc of a circle concentric with the axis of the tool, substantially as set forth,

4L. In a machine for rounding the edges of plates, the combination of a rotating tool, lcvers having their axes in line with the axis of the tool, a plate-holder having one end` or edge connected to the levers, supports for the opposite edge or end and means for rocking said levers, substantially as set forth.

5. In a machine for rounding the edges of plates, the combination of su pporting-rollers, .a plate-holder carried by said rollers, a rotating tool, levers having their axes inline with the axis of the tool, and pivotally connected to the plate-holder, and means for oscillating the levers, substantially as set forth.

6. In a machine for rounding the edges of plates, the combination of a rotating tool, levers having their axes in line with the axis loe nections with the levers, means for adjusting such connections and means for oscillating the levers, substantially as set forth.

7. In a machine for rounding the edges of plates, the combination of a rotating tool, le-

-vers having their axes in line with the axis of the tool, tWo pairs of clamping-arms pivotally connected to the levers, a plate-supporting bed pivotally connected to one member of each pair of clamping-arms, a clamping-bar pivotally connected to the other member of each pair of arms and means for oscillating the levers, substantially as set forth.

8. In a machine for rounding the edges of plates, the combination of a rotating tool, levers having their axes in line With the axis of the tool,'a plate-holder pivotally connectedv to the levers, a shaft provided With cranks connected'V to said levers, means for rotating the shaft and means automatically operative to arrest the rotation of the shaft, substantially as set forth.

h In testimony whereof I have hereunto set my CHARLES C. STUTZ. 

